$389+ Cheap flights from Washington to Belfast Intl (BFS)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
Aug 5 — Aug 121
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Washington to Belfast Intl
Keep the following information in mind while searching for Washington to Belfast Intl flight deals. Data was last updated July 31, 2025.
Round-trip from | $564 (Trip.com) |
|---|---|
One-way from | $389 (Kiwi.com) |
Popular in | July |
Cheapest in | March |
Average price | $1,145 |
Find flight deals from Washington to Belfast Intl
Cheapest flights from Washington to Belfast IntlExplore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.
Explore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.
This Trip.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/147:00 pmSEA - BFS
2 stops19h 25mMultiple Airlines
Mon 9/296:45 amBFS - SEA
2 stops21h 55mMultiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$564
Cheapflights Fare Finder
Customize your flight search to find flights from Washington to Belfast Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from Washington to Belfast Intl Airport that are best for you.
Fly from
Washington
Fly to
Belfast Intl
Route
Depart
Return
Price
SeattleBelfast
SEA - BFS
SEABFS
Seattle/Tacoma Intl
Sun 9/14
7:00 pm-10:25 pm
2 stops19h 25m
Belfast Intl
Mon 9/29
6:45 am-8:40 pm
2 stops21h 55m
$564
SeattleBelfast
SEA - BFS
SEABFS
Seattle/Tacoma Intl
Sat 8/16
7:48 pm-7:40 am
3 stops51h 52m
$389
PortlandBelfast
PDX - BFS
PDXBFS
Portland
Thu 9/18
4:46 pm-9:25 am
3 stops56h 39m
$419
Best time to book a flight from Washington to Belfast Intl
Have a flexible travel schedule? Discover the best time to fly to Belfast Intl from Washington with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Washington to Belfast Intl Airport
What is the cheapest time of day to fly from WA to BFS?
Find hourly flight availability from Washington to Belfast Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from State of Washington to Belfast Intl Airport as you normally would.
Related info for your journey
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Alternative routes for Washington to Belfast Intl
See prices for flight routes from nearby airports that may be better suited for you.
Top airline flying from Washington to Belfast Intl
Discover the top airline that operate flights from Washington to Belfast Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$519 | Average$866 | FlexibilityNo cancel fee | On-time70% |